$ git clone -n https://src.fedoraproject.org/rpms/rubygem-chake.git /var/lib/mock/f45-build-34808-691/root/chroot_tmpdir/scmroot/rubygem-chake
Cloning into '/var/lib/mock/f45-build-34808-691/root/chroot_tmpdir/scmroot/rubygem-chake'...
$ git fetch origin 1a7471fada4c2316f40129859651843a40b76b5c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-chake
 * [new ref]         1a7471fada4c2316f40129859651843a40b76b5c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1a7471f Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild